Bump elasticsearch from 2.3.2 to 6.8.17 in /kvs/YCSB/YCSB/elasticsearch#28

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dependabot/maven/kvs/YCSB/YCSB/elasticsearch/org.elasticsearch-elasticsearch-6.8.17ucbrise/anna:dependabot/maven/kvs/YCSB/YCSB/elasticsearch/org.elasticsearch-elasticsearch-6.8.17Copy head branch name to clipboard